The relationship is proportional if there is a constant ratio between the variables. In this case,
Number of players/Teams = 6/1 = 12/2 = 18/3 = 24/4 = 6
Given that the ratio is constant, then it is a proportional relationship.
k is equal to the ratio found, that is k = 6
The general equation for proportional relationships is:
y = kx
Defining,
y: Number of players
x: Teams
the equation is:
y = 6x